Machine for closing and tying sacks



INDGREN.

MACHINE FOR CLOSING AND TYING SACKS.

APPLICATION FILED DEC- 3.1921.

` rammed De@.5,1922.

l0 SHEETS-SHEET l.

A TTOENE Ys? F. 0. LINDGREN. MACHINE FOR CLOSING AND TYING SACKS."

`APILIcIITIoII FILED ums, 1921.

' Patented Dec. 5, 1922.

l0 SHEETS-SHEET 2.

RA K 0. L/NDGREN @YW @.J

ATTORNEYS VE N TOR F. 0. LINDGREN.

MACHINE FOR CLOSING AND TYING SACKS.

APPLICAUON FILED 056.3, i921.

Lggg, l Patent@ De@.5,1922.

l0 SHEETS-SHEET 3.

zes E@ "3 l 29,4; ze @Q4 f' sa 28a Zvw-:wrom 29 C Fim/WO. L//vDGREn 5y www F. 0. LINDGREN- MACHINE FOR CLOSING AND TYING SAlCKS.

APPLICATION FILED 0511.3, I92I.

.1 -,437598 y muted Dee. 5,1922b` F. 0 LINDGREN! MACHINE FOR CLOSlNG AND TYING SACKS.;

APPLlcAIloN FILED pms, 1921.

Patented De@E 5, 192A l0 SHEETSTSHEEI A5.

GW G

ATTQRNEYQ.

F. OILINDGREN.

MACHINE IFOR CLOSING AND TYING SACKS. APPLICATION FILED 050.3. I92I.

l0 SHEETS-SHEET mno F7619. f g

sz Izq, '4S ua 250 ,17; o |24 Il." zal@ @[4 "'4 62 ma 1 zas (faQ/m F. 0. LINDGREN.

MACHINE FON CLOSING AND TYING SAGKS.

APPLICATION FILED DEC. 3| I9'2I.

Patente 1)eei5g19223a A T TORNE YS,

F. (LILINDGREN. MAcHlNE Fon cLosmG AND TYING sAcKs.

APPLICATION FILED DECLS. 1921.

Patented Dec. 5, 1922.

l0 SHEETS-SHEET a.

BIS

ATTORNEYS.

F. O. LINDGREN.

MACHINE FOR CLOSING lAND TYING SVACKS.

APPLICATION FILED uma.. I92I.

l gyg, Patented Dec. 5, `E922.

10 SHEETS-SHEET 9.

F/ci *16,

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IIIlIIlIlI-'I I I u II II II s4 ATToR/WEYS,

Cil

Patented Dec. 5, 11922.

. @Filme ivrnenrnn roncLosING Ann TYInesAoKs.

Application led December 3, 1921. Serial No. `519,718.

To all whom t may concern:

Be it known that I, FRANK O. LrNnennN,"

a citizen of the United States, residing at Minneapolis, in the county fot Hennepin and- State of 'lilinnesotm have invented certain new and useful improvements in Machines for Closing and Tyingllacks, of which the following is a specification.

My invention relates to machines for clos-k ing and tying sacks, and has for an object to provide mechanism'which kwill close and compact the mouth oi the sacln'lay loops oiz cord around the compacted 1nouthar-` range said loops lso that the ends the ,cord `will be held in anchored position to form a so-called knot, tighten the same by the action of the cordflaying mechanism and grip the cord beyond the loopswhich have been itormed, andsever this cord when vthe tying operation has been completed, so that the cord Will be lett in condition 'tor another tying operation. Other 'objects are to provide for tensioning and holding` the cord` to permit the cord-laying mechanism to take up slack and tighten the knot, and to initiate the cycle o't' operations `of the knotter by the actor" conveying' illed sacks into proper position to ,be tiedi rrllhe 'full objects and advantages of my invention will appear in connection'with the detailed description, and the novel fea-` tures embodied in my inventive idea `will be l particularly pointed out in the claims.`

ln the drawings which illustrate one oi' the forms in which my invention may bey employed, Fig. 1 is a front elevational AView oil the complete machine. yl" ig. 2 is a side elevational View 'of the complete machine. Fig. 3 is a top planvieiv oit the complete machine. Fig. l is a vertical section on the line 1 4 of Fig. 1. Fig. 5 is a View of the knotting mechanism vin horizontal section on the line 5 5 of Fig. 1. `Fig. G is a development oi" a cam which is embodied in my machine, this View showinga cooperating roller in diilerent positions. Figsk, 8, 9, 10, 11 and 12 are views taken on the same line as Fig. 5 showing certainyparts in Fig. 13 is lnogressively diiierent positions. Y a View of the completed knot. Fig., 14 is a 'View in section on the line 1&414 of'Fig. 10. Fig. 15 is a viewv in section on the line ifs-15 or Fig. i1. View ci? the knotter rWith a small portion thereof broken away. 17 is a View in section on the line T11-17 ot Fig. 26. Fig.

Fig. 16 is a top planr 18 is a kview in section on the line 18---18y oilil 26. F ig. 19 is a View correspond? ingt.o Fig.1 6 showing a cam in a dili'erent position. Figs. 20,21, 22 and 23 are detail yviews yshowing a cam memberl in different positions. Fig. 24 is a view in section on the line2--24y ofk Fig. 10.y Fig. 25 isa bottom plan View of the mechanism which is 'shown in Fig. 2li. Fig. 26 is av View in sectionon `the line 26-26 o`-Fig.`17. Fig. 27l is a view in section on the line 27-27 ot' Fig. y3. Y

.For convenience of description, the knotting.` mechanism will first be described in detail and then the complete machine described as an entirety.

rllhe main operating shaft 28 of the knotting mechanism is mounted in bearings 29 formed on the irameworkof the machine, and is intermittently driven by means of 'a spur gear 30 f secured thereto which is adapted toy mesh with the teeth of amutilated gear 32 secured to a short shaft 34 to Which is also secured. a sprocket Wheel 36.

Wheel 36 and over a sprocket wheel t0 secured to a sha-tt 42 which is driven by means which will be described later. Secured upon the shaift 28 is a large bevel gear 411i.

anda smaller bevel gear L16 which has teeth only forabout one-halt of its circumference. `The .Qears and 46 and the parts associated therewith drive the various mechanismsfor passing the cordy around the gathered mouthyoii the sack and for tying this cord. The gear 46 is adapted to mesh fwitli a gear 47 which is secured toa vertical shaft e8 mounted in a bearing` 50 carried by a bracket 52 secured tothe frame oi the machine as best shown in lig.y 4. The hub 530i a bevel gear is rotatably mounted in the bearing 5() and this hub rests upon aliange 56 on the lower endy of tends under a clamping lever GGKWhich is pivoted to the finger. Theloiyerend of this lever has a clampingl proiection 68 which so ifi... sprocket chain runs over the sprocket f may be adjusted by a set screw 70. The manner in which' the clamping lever is operated will be describedlater. From an eye 72 at the lower end ot the linger'62 the cord passes to a gripping and cutting member which includes a linger 74 which has an upper right angular portion .75 secured to the lower end of the shaft 4.8 as shown in lligs. e and 17. Slidably mounted in a vertical passageway in the finger 74k is a shank member T6, the lowerend of which has a combined gripping and cnt-ting head 78. This head is stressed upwardly by a spring 80 secured to a projection 82 on the shank 76 and to a projection 84- on the linger 74T as shown in Fig. 18. The upper end oit the shank is provided with an inwardly extending projection 86 best shown in Fig'. 26 which during the first part of the rotation or the linger 711 :trom the position shown in 26 rides upon a track 88 formed upon the upper peripheral surface oigan annular fia-nge 90 extending around 'the lower portion of the bearing member 50. The 'track 88 starts with an upward incline 92 and'ailiter extending forA more than a semi-circumference terminates at a point 94. The projection 86 while movying` on the track 88 holds the head 78 firmly tion 96 so that the head is forced downwardly into open position and is held down byy upwardly so that the head 78 is broughty into closed position. The projection 86 then rides up the incline k92 and comes into the initial position shown in Fig. 26. rThe inner end of the lever 66 as will appear` from Figs. 17 and 26 rides upon a track havinga depressed portion 102 starting at a shoulder 104. The depressed portion 102 terminates in an incline 1.06 which leads up to a. raised portion 108 of the track. Vllhen the lever 66 is nursing from the incline r106 to the shoulder 104, the end of the lever rides on the raised portion 108 and the clamping projection 68 will be held down on the portion ot the cord positioned thereunder so as to apply tension. Secured upon the main operating shaft 28 ot the knotter is a cylindrical member 110 having a cam slot 112 extending around in its peripheral surface. An arm 114e has roller 116 mounted on its tree end which rides in ythe Cam slot 112. Fig. 6 represents a development of this cam member and shows different positions of the roller in the Cain slot 'which positions are indicated at 1163, 116, 1162116@7 116, 1162 and 116g. The arm 114 is securedto the upper end of a rock shait 118 mounted in'bearings 120 carried by the frame or' the machine. ltigidly secured to the lower end of the rock shaft 118 is a horizontal tubular member 122. Mounted within this tubular member for limited sliding and rotative movement is a cylindricalA shank member 124; to which is secured a pin 126 adapted to move in a. slot 128 in the tubular member, this slot at itsy forward portion being reduced to provide a shoulder 130. integral with the shank 124 is a blade 132 adjacent which is a blade which is pivoted to the shank at 186. 'llhe pivoted blade 13d is normally held so as to rest upon the'rigid blade 132 and lie parallel thereto by a vspring 138 attached at opposite ends to the two blades. Then the shank 1241- .is pulled to the left the pin 126 is pulled ofi the' shoulder 130 as will appear from Fig. 11. A. coiled spring 140 is secured at one end to the shank 1241 and at the other end is secured to the tubular niember 122. This springis so tensioned that it tends to hold the shank toward the right as viewed in Fig. 11 so that the pin 1,26 will rest upon the shoulder 130. The spring 140 is also so tensioned that when the nin 126 moved to t ie lett oil' the shoulder 130 then the shank is caused to turn forwardly and bring the blades 132 and 134 trom a position lying in a horizontal plane into a` downwardly inclined position. '.llhe forward edge ot the pivoted blade 134 carries a pair ot upstanding spaced vfingers 1412 and 114 which when the two blades lie parallel, lit upon the opposite sides ol' a. linger-1,46 extending up from the forwardv e le oi" the rigid bladev13n. Secured to the traine of the maehine and extending under the blades 182 and 134 is a rearwardly from the position slmwn in Fig.

will the cam surf ce in such manner that the blades will be moved back into their horizontal position. At the same time Vthe pin 126 will be drawn into eng Ifreinent with the shoulder and thus the 4l-.ilades will be held horif/.ontall57 positioned when the rock shaft brings them forwardly into the posi-A tion shown in Figs. 7, 8` 9 and 10. .l s shown in Fig. 2a. the pivoted blade 184; is longer than the blade 132 and the projecting end loil this pivoted blade is provided with a downwardly extending pin 150. Cooperating with this'pin and with the projecting end ot the blade 18e is an oscillating arm 152 having an upstanding ledge 154i for engagement .L to that shown in lili 12. the lower blade iso with the front of the pivoted blade and an upstanding ledge 156 tor engagement with the pin 150. it the proper time in the cycle ot operations, the shank 124 and the blade 132 attached thereto are swung forwardly', the pivoted blade being held against forward movement by its engagement with the ledge 154 so that the linger 146 moves :forward from between the lingers 142 and 144 in order to provide sullicient space to receive the cord which is then gripped between themr when the blade 132 moves backward to a slight extent. At another time during lthe cycle of operations, the oscillating arm 152 is swung outwardly and the ledge 156 pulls on the pin 150 so that the pin 126 is pulled oli the shoulder 130 andthe spring 140 then causes the blades carrying the iingers 142, and 146 to tilt forwardly. The arm 152 "is secured to the lower end oiz a roch shaft 156 and secured to this arm is an upstanding lug 166 with which the pivotedv blade 134 enga-ges at the proper time and is held back that the cord may be released from ben vtween the finger 146 and the lingers 142, 144.

The arm 152 is normally held inwardly by' a coiled spring 162 surrounding the shaft 158 and secured thereto at one end and secured at the other end to the frame. The shalt 156 is mounted in bearings 164 on the 'trame and secured to the upper end oit this shaft is an arm 166 to the outer end ot which a bar 166 is pivotally attached. rlhc Jforward end or this bar is provided with a slot 170 through which the upper end oit the shaft 48,

extends. The spring 162 tends 'to hold the bar 166 hackwardly so that the front wall oif the slot 1T() is in engagement with the shaft 48. Secured tor the bar 166 in front of the slot 116 is an upstandiiig pin 1,72 while secured to the upper end oi the shaft 46 tor cooperation 'with this pin is a cam member having two opposite cam portions 114 and 176. The cam '"1 at the proper time pulls on the bar 166 and firm 1:12 is operated thereby to release the pin 126v so that the blades are tilted previously stated. The cam 176 at the proper vtime pulls on the bar 168 and operates the arm 152 so to bring the lug 160 into the path ot the projecting end of the pivoted blade and release the end ot theccrd which is held between the lingers on the blades. The comn plete cycle of operations oi: the knotting mechanism will now be apparent. lll/Then the parts ot the. knetter are at rest in the posiin shown in 1l. 5. 1,6. 1?, 18 and 26 a filled sa -lr is moved into tying position under the lrnotter by means to be described ylater and which starts the lrnotter. causes rotation oie the gear 54 and rotation oi the linger 62 throuch which thecord is threaded. The endoi` tie cord at this time held by the head 78 at the lower end ot the 1inger il. @n laccount ot the Gear 46 cord between the lino-e being mutilated, the ringer 4 does not immediately begin its movement but remains at rest during' the early part of the tying operation.r `The cord C will,there1ore, bey carried along the right hand side of the mouth oit the sach S as shown in Fig; 7 and back of the lingers 142.144 and-146 which at this time are close together. rEhe` roller 116 soon after this operation occupies the position in the groove 112 indicated 116b`in Fig. 6, so'thatthe blades and 134 are brought forwardly. Continued rotation of the linger 62 brings the cord forward around the mouth or the saclr as shown in 8, it being noted that the finger 62 passes outside oit the finger 743 and when the linger 62 reaches the posiH tion shown in this figure the teeth on the mutilated gear 46 come into t engagement with the teeth olf the gear 4i" so that the r starts to move in a circular path but in the opposite direction from 4that in which the finger moves. 4rlhe roller 116 now occupies the position in the gro-ove 112 indicated at 116d in Fig. 6 so that the blades 132 and are moved. bach ly whereby the linger 62 now passes in .rout et' instead ot bach: oit the iingers 1e' 144 and 146. llillien the linger 62 has passedthis position7 the roller 116 comes into the position indi cated at 116c in 6, thereby causing the M to come forward to .its former position with its project-i g end in engagement with the ledge 154 and causing the blade 132 to come still further forward so that its linger 146 is spaced ahead of the Alingers 142 an es shown in l-ig. 16. 'vl-The lower end of the n er 74 carrying the end of the cord passes though this space thereby laying the 146 and the lingers ier 116 then comes into the position shown .t 116f in Fig. 6,y thereby allo-wing the'iinger to return so `as to be flush with the lingers 14-2`an1l and grip the cord. llllien the rincer T4' has passed p *his space its c head 78 forced down on accountY ot tl" per end ot the shanlv` T6 moving under the downwardly inclined traclr portion and the end of the cord is released so asie lee held o'` the iinger146 and the linger: '142. During this time the finger 62 again carries the cord around the mouth or the sack, this portion of the cord being underneath the portion which is being` carried by the linger 74 but being abore the portion previously laid as is evident trom 10.` Also du 0 this time. the lower portion ol the clam?L lever 66 has been caused to clamp the cord on account oi? the other end ot the lever riding on the incline 108. This places the cord under tension so that it is drawn tightly around the mouth of the saclr. it the saine time the cam 174 pushes on the pin 172 as shown in Figs. 21 and 22, thereby withdrawing the pin 126 from the shoulder 130fand causing the bl ad e 1114 between y -nicaius of which es reaiwvardlj7 thereoj,v moving` the hl l into the position shown in lf2 and pulling taut the end of the cord carried thereby i t at the cord is looped ar und the mouth of sack by means ot loops which are positioned as shown in Fig. l. `While the blades moved rezrwardly, thevv are restored t their position in a horizontal plane f ridino up on the cam arm 148. The cam "t5 now pushes forwardlj7 on the pin 172,

are heine' therelf aging the lug' 1GO in trent ot the projectnr eud oi' the blade 134e so that when continued ction ot the cam groove 112 on the roller 11o moves the same into original position, the blade 134i will he held hack in order to release the end ot the cord. The sack is iirmly tied since the loops around the mouth thereof oc ",upy the position shown in Fig. 13, and since these loops have been pulled taut in order to anchor the protrudiugjends ot the cord. The cord threaded through the finger 62 has not however jfet heen cut off hut Yas the fingers G2 and 741 ap- 'infcach each other from their position shown in Figi. 11 toward their position shown in 1432512, the cord is caused to pass above the ipping head 7S carried hy the shank 76 which .is still held in open position by the downwardly inclined track portion 96. As soon as the shank reaches the oja-p 100, the head 78 is pulled up with a quick snappv actionhy the spriiig; 80 and the intnrned upper end ot the slninlr rides up the incline so that the cord iii-miv logripged h v the head '[8 and'is out hv the sharp edges tween the same und the lower end of the finger 7e rEhe operation of the knotting mechanism is stopped on account ot its oper: ting; connections to he d scrioed later; and now ready to commence another cycle ot operations such as just described.

rllhe mechanism by means ot which mouths ot the sacks are gathered and hv the cycle ot operations ot the knetter i iated and perfo ed will .new he descri1 A motor 173, preterabljv an electric motor, is mounted on a support 1S() carried h v the traine oi" the machine. Secured to the motor shatt is rear 182 which meshes with a. gear 184 secured to a shaft 186. liso secured to this shaft is a sjn'ocket wheel 188 over which runs a, sprocket chain 190 which also runs over a sprocket wheel 1952 secured to a shaft 19-1. Looselp7 mounted on the sha'lt 194 and rest ained 'from rearward movement hy a col-v lar 195 secured thereto is a sprocket wheel position 11G shown in over which runs asprooket chain 198 also run" ing; over a sprocket wheel 900 secured 7o he shaift L12, previously referred to. rEhe. sprocket wheel 196 carries a clutch member 202 with which is adapted to cooperate a double clutch member 204 splined on the shat 1941e this double clutch member heine' also adapted to cooperate with a clutch memoer 20G secured to one end a sleeve snat 20S rotatahly mounted on a portion ot' the shaft 191i. llo the other end of the sleeve shaft 208 is secured a lievel gear i210 meshing with a. bevel gea-r secured to the upper end ot vertical shait i212. Sjglined on the latter shaft is a bevel gear 21e which is rotatably held h v a collar carried hy a voke 2153 which has a hearing 920 'for a shaft Q22 on thc end olf which is secured a bevel 224 which n'ieshes with the oevel Secured to the shaft is a roller over which runs an endless helt 226 also running; over a roller 22S rooital'iljT carried hv a sleeve 230 having; internal threads en threaded. shaft to the lower end ot which is secured a sprocket wheel 234i over which runs a sprocket chain 23o whi h also runs over sprocket wheel secured rto the lower ot a threaded shaft E24() which enleapges internal threads of a sleeve 24). carried h v the voke Q18. Secured to the upper end ot the shaft 2110 is a hand wheei 244e upon rotation of which thc heit Q26 majY he raised and lowered in order to position ditlerent sized sacks at the proper height t'or the tying` operation. 1t .is evident that when the douhle clutch member E20-(l is engaged nith the clutch member 20G as shown in Fig. 5. the belt Q26 w ill he operated and the knottinp; mechanism will he at rest and when the clutch member 2,04 is in engagement with the clutch incmoer 202. as shown in Fig'. 7T the knotting mechanism will he opera d and the belt Q26 will he at rest. The tollowi of mechanism is j'z-rovided for shitting` the d uhle clutch meiiiher at the proper times. .rrotataldy mounted in a hearing' Q46 is shalt 24.8 to the lower end ot which are secured tour radiallf.'v extending arms 250 and also a star wheel located above these arms and having tour projections 252 disposed mid-.waj7 between the arms 250. liilhen a illed sack is placed on the helt 226 and is carried alongthereby, this sack enone oit the arms so as to cause partial rotation. The projections 252 of the star wheel cooperate with a roller x-l mounted on one end oit a hell crank 256 trom the other end ot which is a link connection 9158 extendingto the lower end ot a lever 260 which is pivoted at 2Go to a iiXed arm 263. Below this pivotal point, the lever is attached to the douhle clutch member 20% as shown in Figs. 1 and 4c. Secured to a projection on the upper portion ot the lever 260 and to a projection on the fixed arm 263 is 3a Ai'machine for tying sacks comprising a finger through which the cord is threaded, a linger for gripping the end of the cord., means for causing said fingers to move in. opposite directions around the mouth of the'saelr, means for causing said gripping linger to release the end of the cord when laid, and means for causing said gripping linger to re-grip the cord beyond the portion thereof which has been laid.

et. machine for tying sacks comprising a finger 'through which the cord is threaded, a finger for gripping the end of the cord, means 'for causing said lingers to move in opposite directions around the mouth of the sack, means for causing said gripping finger to release the end o'f the cord when laid, means 'for causing said gripping fingerto re-grip the cord beyond the portion thereof which has been laid, andmeans carried by said gripping finger for cutting the laid cord adjacent the ire-gripped portion.

A. machine tor tying sacks comprising a finger through whichthe cord is threaded, a finger for gripping the end of the cord, means for causing said lirst mentioned linger to more twice around. the mouth of the sack, and means for causing. said gripping finger to move once around the mouth of the saclr in the opposite direction from that of said first mentioned linger.

6. machine for tying sacks comprising a finger through which `the cord is 'threadedA` a linger for gripping the end of the cord, means for causing said first mentioned finger to move twice around the mouth of the sack` and means associated with said gripping finger which causes it to remain at rest during the first portion of the movement of said first mentioned finger and then move once around the mouth of the sack during the second portion of the movement et said first mentioned finger and in opposite direction to the direction of movement thereof.

7; A. machine for tying sacks comprising a linger through which the cord is threaded,

:i li'iger for gripping the end of the cord, means for causing said first mentioned linger to move twice around the mouth of the sach. means associated with said gripping finger which causes it to remain at est during the first portion of the movenent oi' said first mentioned finger, and then ore once around the mouth oit the sack during` the secondportion of the movement of said lirst mentioned finger and in the opposite directionto the direction of movement thereof, two cooperating holding members positioned on the opposite side of the Louth of the sack from the initialposition of said vfingers,'means associated with said holding` means for positioning them in such manner that the firstl lmentioned finger rlsses bach of both of them during its first and so that the gripping finger passes between them during its rmovement around the mouth. oit the sack, means winrfh causes said gripping finger to release the end of the cord when it has passed between said holding members, and means 'for causiig;r said holding members to come together and hold the end of the` cord when thus released.-

S. machinefor tying sacks comprising a cord holding device which is positioned adjacent the mouth of the sack when the latter is in tyingl position, cord laying means rotatable in one direction around the month of the sack, means for causing said cord laying means to move twice around the mouth of the sacln a cord gripping member rotatable in the other direction around the mouth of the sack, means for causing sahl cord gripping member to move once around the moutli of the sach, iieans for positioning said cord holding device in such manner that cord laying means during :a first rotation is .caused to pass around he same and during its second rotation is causer. to vpass between the same and the mouth of the sack and said cord gripping member isv caused to la i the cord err ed l e thereby above the portion of the cord laid by said cord laying;r` means, means for causing thev end of the cord gripped by said cord y' ipping member to be released and held by said cord holding device, and means for causing the portion of' the cord passed around said cordfholding device to'be freed 'from the same and pass above the end which is heid by said cord holding device whereby the cord `will be secured around the mouth et the sack by inter-engagement of the looped portions of the cord.

9. iii. machine for tying sacks comprising means for .laying a cord around the mouth of the saclr, two pivotallj.T connected. blades having projections between which a portion of the cord ield and :i round which another portion et the cord is laid, and means for tipping said blades to release said last mentioned portion of .he cord while the other li of said portions is still held between said projections.

1 0. il machine 'for tying: sacks comprising means forlaying a cord around the mouth of the saclr. two pivotally connected blades having projections between which a portion of the cord is held and around which another portion of the cord is laid. a spring` adapted to tip said blades to release said last mentioned port-ion of the cord while the other of said portions is still held between said projections, a spring normally holding said piifoted blades together, and means for openingY said blades in opposition to the tension of said last mentioned spring to release the portion ci the cord held between said projections.

11. if; machine tor tying saclis comprising` means tor loving; a cord around the month et the sa blades hay'i j pio 'een which portion. oit' the cord is held and rf i which another portion of the cori` .cuna shank to which one of saidblaev l, rigidly atl tached, a. tubular member in which said saanli is rotatably mounted, a -spi"ng tend.- ing' to cause rotative rot said shan act a predetermined time to impart a rotatiic movement to said yshank tortilting said blades, means tor restoring' niidV to horizontal position, a spi k n. if* mally holding said blades together, and means for opening` said blades a predetermined time in opposition to the tension of said last mentioned spring` to` release the portion ot the cord held between said projections.

12. il machine for tying sacks comprising means tor laying?,- a cord around the mouth ot thc sack, two pivotally connected blades having projections between which portion ot the cord is held and around which another portion of the cord is laid, a shank with which one ot said blades is rigidly attached, a tubular member in which said shank is slidably and rotatably mounted, a spring tending to cause slidable and rotative blades movement oic said shank, means preventing" spring to releasethe portion of the cord held between said projections.

13. il machine for tying sacks comprising means for laying a cord around the month of the sack, a cord holding device which is positioned adjacent the month of the sack when the .latter is in rcord tyingposition, and means for imparting oscillatory moirenicnt to said cord holding; device in a path substantially at right angles to the sach.

let. il, machine for tying sacks comprising means for laying a cord around the mouth ot the sack, two pivotally connected blades having projections between which a portion. ot the cord is held and around which another portion ol the cord is laid, a spring normally holding said blades together, and a cam which opens said blades and then al-v lows them to close in order that the cord oeans for permitting said spring`r toL4 may be passed between said projections and held thereby. j

i5. machine toi" tyingsacls comprising o the two pivotally connected blades haring p ojections between rwhich a zrtion away from the mouth oli the `s^ i and mean.. or opening said'blades to release the held portion of the cord.

` 16. A machine for tying sacks comprising means for laying a cord around the mouth ot the sack, two cooperating blades having projections between which a portion ot the cord is held and around which another portion oi the cord is laid, a movable member to which one of said blades is rigidly attached and to which the other of said blades is pivotally attached, means normally holding said blades together, a stop member with which said pivotally attached blade is adapted to engage, a cam having successive portions thereof constructedto actnate said movable member and cause said blades to move torwardly into initial cord laying position,` then to move slightly backwardly, then to movey forwardly so that said rigid blade is brought still further forwardly while said pivoted blade is held bach by said stop member, then to move said rigid blade baclrwardly so as to be evenwith said pivoted blade, and then to move said blades backwardly to their former position, and means for opening said blades to release the held portion of the cord.

17. A machine tor tying Sachs comprisn ing means 'for *laying a cord around the mouth of the sach, two pivotally connected blades having projections between which portion ot the cord is held and around which another portion ot the cord is laid, a movable member upon which said blades are slidably mounted, means :tor operating said movable member to bring said blades into iorward and rearward position, a rocking member cooperating with said blades, and a cam having two cam portions, one oi" which actuates said rocking lmember to cause sliding movement of said blades when they arc in forward position, and the other oi which. actuates said rocking member to open said blades and release the held portion of the cord, when said blades are in baclmvard position.

18. A machine for tying sacks comprising` a pair of jaws for forcing the mouth oiE the sack together from opposite sides, a fixed plate and a movable plate between which the coro around. the vmouth Cgi mouth of the sack is squeezed at right angies to the action of saidjnws, means whereby said aws are guided by said fixed plate, means for thereafter laying` cord around the compacted mouth, and means for securing the laid oord.

i9. A machine Yfor tying' sacks comprisingl a pair of jaws for forcingA the mouth of the sack together from opposite sides, a pair of plates acting` at right angles to said jaws for forcingthe mouth of the sack together, two

cord laying,r fingers, means for causing` said.

fingers to move in opposite direction around the month of the sack, and means for re tracting said jaws.

20. A. machine for tying sacks comprising normally inoperative cord laying mecha-- nism, two pivotally connected members hai'- ing projections between which a portion of the cord is held, a spring normally holdin;T

said pivoted members together, means for opening said members in opposition to the tension of said spring to release the portion of the cord held between said projections, a conveyor for feeding;` sacks through the niaehine, means controlled by the feed ofi the saclrs for stopping said conveyor with a sack in tying position and for causing` said cord laying mechanism to Operate, and means or startino said conve or after .said aivoted members have been opened.

In testimony whereof l hereunto affix my signature.

FRANK O. LINDGREN. 

